TM 9-6115-624-BD
Table B-1. Tools.-CONT.
Item
number
Level
NSN
Description
39
C
5120-00-277-4244
Wrench, plier: straight jaw, 8-1/2 in.
40
C
5120-00-148-7917
Wrench Set, combination box with
open end, 12 components, 5/16
in.-1 in.
41
C
5120-00-148-7918
Wrench Set, open end, fixed, 6
components 3/16 in.-1-1/16 in.
Section III. TEST EQUIPMENT
B-3. Field Expedient Test Equipment . Sometimes, in the process of assessing the battlefield damage, it is necessary
to make voltage and resistance measurements to determine where the fault is. Standard test equipment (voltmeter,
ohmmeter, SWR meter, etc.) should be used whenever possible. If standard test equipment is not available, field
expedient equipment can be fabricated using parts commonly found on the generator and in the forward maintenance
areas. The following paragraph provides fabrication instructions for making a voltmeter, ohmmeter, and RF transmitter
output tester.
NOTE
Accurate measurements are not available. These are Go-No-Go meters.
WARNING
This voltage indicator can only be used safely below 37 volts DC.
a.
Making a Voltage Indicator. A voltage indicator can be made from a light bulb and two pieces of wire
(figure B-1). The pieces of wire can be connected to the case and center terminal of the bulb by means of solder,
twisting, or simply holding the wire ends against the bulb (see illustration). The voltage rating of the bulb should be close
to the value of the expected voltage being tested. For voltages in the 18 to 30V dc range, any light bulb on the driver's
master panel, driver's instrument panel, gunner's panel, commander's panel, or gunner's primary sight can be used. For
voltages of 5V dc or less a two-battery cell flashlight can be used. The presence of voltage will cause the bulb to glow.
Polarity of DC voltage does not have to be observed; even ac voltage can be measured. Twist exposed wire ends
together and I apply solder, if available, and solder. Touch wires to voltage source when ready to test for voltage.
B-4 Change 1
